Add an option to the test runner to kill the process on SIGINT

instead of raising an exception.

This makes it easier to work with tests that get into uninterruptible
states (such as threading.Lock deadlocks)

diff --git a/tornado/testing.py b/tornado/testing.py
index 0ad5bff4cd3c7c12de9cfd4f064f988da3f4c0cd..bf49edf8b0db1f89af46aa602cbdd905ab510841 100644 (file)
--- a/tornado/testing.py
+++ b/tornado/testing.py
@@ -26,6 +26,7 @@ from tornado.httpserver import HTTPServer
 from tornado.stack_context import StackContext, NullContext
 import contextlib
 import logging
+import signal
 import sys
 import time
 import unittest
@@ -325,12 +326,20 @@ def main():
     define('autoreload', type=bool, default=False,
            help="DEPRECATED: use tornado.autoreload.main instead")
     define('httpclient', type=str, default=None)
+    define('exception_on_interrupt', type=bool, default=True,
+           help=("If true (default), ctrl-c raises a KeyboardInterrupt "
+                 "exception.  This prints a stack trace but cannot interrupt "
+                 "certain operations.  If false, the process is more reliably "
+                 "killed, but does not print a stack trace."))
     argv = [sys.argv[0]] + parse_command_line(sys.argv)
 
     if options.httpclient:
         from tornado.httpclient import AsyncHTTPClient
         AsyncHTTPClient.configure(options.httpclient)
 
+    if not options.exception_on_interrupt:
+        signal.signal(signal.SIGINT, signal.SIG_DFL)
+
     if __name__ == '__main__' and len(argv) == 1:
         print >> sys.stderr, "No tests specified"
         sys.exit(1)